A new service update (SU4) for SQL Azure Data Sync service is now live! The most noteworthy new feature in SU4 is to allow users to edit existing sync groups to cater for schema changes. For step-by-step guidance on how to edit sync group for different kinds of schema changes, please refer to this post on Windows Azure blog: http://blogs.msdn.com/b/windowsazure/archive/2012/04/03/announcing-sql-azure-data-sync-preview-update.aspx
Allowing sync group update to cater for schema change was the feature with the highest voting on Data Sync feature voting site: http://www.mygreatwindowsazureidea.com/forums/44459-sql-azure-data-sync-feature-voting. Go there today to add or vote for your favorite Data Sync feature!